Pin Assignments
D-5
3550-A2-GB20-40
July 1999
Table D-5
EIA-232/V.24 Connector Pin Assignments
Pin
Circuit Name
F nction
Pin
EIA-232
ITU-T
Function
2
BA
103
Transmit Data (TXD)
3
BB
104
Received Data (RXD)
4
CA
105
Request-to-Send (RTS)
5
CB
106
Clear-to-Send (CTS)
6
CC
107
Data Set Ready (DSR)
7
AB
102
Signal Ground (SG)
8
CF
109
Received Line Signal Detect (LSD)
9
—
—
Positive Test Voltage
10
—
—
Negative Test Voltage
12
CI
112
Data Signal Rate Selector I – DCE Source
(alternate external control lead I)
13
1
—
—
Data Signal Rate Selector II – DCE Source
(alternate external control Lead II)
14
SBA
118
Secondary Transmit Data
15
DB
114
Transmitter Signal Element Timing – DCE Source
16
SBB
119
Secondary Received Data
17
DD
115
Receiver Signal Element Timing – DCE Source
18
LL
141
Local Loopback (LL)
19
1
—
—
Data Signal Rate Selector II – DTE Source
(alternate external control alarm Lead II)
20
CD
108.2
Data Terminal Ready (DTR)
21
RL
140
Remote Digital Loopback (RL)
23
1
CH
111
Data Signal Rate Selector I – DTE Source
(alternate external control alarm Lead I)
24
DA
113
Transmitter Signal Element Timing – DTE Source
25
TM
142
Test Mode (TM)
1
Data Signal Rate Selector function is not available at this time. These leads can be used for the External
Lead functions.
Содержание Comsphere 3551
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Страница 101: ...DSU Menu A 3 3550 A2 GB20 40 July 1999 ...
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Страница 129: ...Pin Assignments D 7 3550 A2 GB20 40 July 1999 Figure D 5 EIA 232 D Crossover Cable 4951 035F ...
Страница 134: ...COMSPHERE 3550 Series Data Service Units E 4 July 1999 3550 A2 GB20 40 ...